Zeppelin flying controls with itween

I'm trying to make 3 lines of air ways which a zeppelin can fly towards the secreen (z axis). When player pushes left and right buttons I run these lines to animate zeppelin :

 void Right()
     {
         iTween.MoveTo(gameObject, iTween.Hash("x", 18, "easeType", "easeInOutExpo", "loopType", "none", "delay", .1));
         iTween.RotateTo(gameObject, iTween.Hash("y", 25,"z", -20, "easeType", "linear", "time", 1));
         iTween.RotateTo(gameObject, iTween.Hash("y", 0, "z", 0, "easeType", "easeOutQuad", "time", 1, "delay", 0.8));
                     
     }
     void Left()
     {
         iTween.MoveTo(gameObject, iTween.Hash("x", -18, "easeType", "easeInOutExpo", "loopType", "none", "delay", .1));
         iTween.RotateTo(gameObject, iTween.Hash("y", -25,"z", 20, "easeType", "linear", "time", 1));
         iTween.RotateTo(gameObject, iTween.Hash("y", 0, "z", 0  , "easeType", "easeOutQuad", "time", 1, "delay", 0.8));
     }

Zeppeling needs to fly forward but when I press left and right it also needs to go side ways with this yawning animation. What happens is zeppelin flys through and when I press left it stops, goes left and continues flying.

I also tried rigidbody and addforce to a parent object. Samething happened there. Flys but stops when changing lane.

Can anybody show me a clue to how to do this ?

Thx in advance.